Cacophony

1. Jarring, discordant sounds.

2. The use of harsh or discordant sounds in literary composition, as for poetic effect.

EX: Breakers crashed onto jagged rocks and clawed the sands with brutal strikes, pummeling the beach.

http://www.youtube.com/watch?v=46EUWULgeUI

go to 3:40 to 4:55

http://wiki.answers.com/Q/Examples_of_cacophony